Do not get a big cup (eg. mug). Brew numerous small (~120ml) cups. Tea is then always hot/warm. Also, making small breaks is good when studying. Brew tea with an empty mind. Get back to the context. Bi luo chun, if you like bitter, can be brewed to a kick-potent state.

Tea can bring kick and clearness of mind. Coffee can bring kick and mudiness of mind.

If you're at the library, bring a thermos of some potent tea (eg. Bi luo chun brewed on the heavy side) and a small cup.

Having tried both, the monolthic 'big mug' (!) approach and the one with little breaks, I can see the difference.

Sheng puerh are certainly one nice tea to have in those times. For some reason I focused on green bi luo chun in my reply although just about any sheng puerh would be fine. oolongs in general, I'm not so sure.

I used to do a lot of dark roast Ti Guan Yin, but that was pretty much the only tea I drank back then. And for exams, Morning Thunder from Celestial Seasonings--would take a bottle of hot water, drop in a few teabags, and head off to take the tests.

I'm long finished with school/finals but I wanted to thank everyone for the suggestion to make several small cups instead of one large mug/pot. In the evening I had been making a 16oz Laurel Birch coffee mug worth, but it would always get cold, etc. This weekend I got 2 8oz Boudin 2 layer glass tea cups and it makes my tea experience in the evenings much more enjoyable. I make just one cup at a time and it stays warm enough so I can finish.